export class LsjFile {
	constructor(data) {
		this.dom = null;
		// files.type = waiting（等待上传）|| loading（上传中）|| success（成功） || fail（失败）
		this.files = new Map();
		this.debug = data.debug || false;
		this.id = data.id;
		this.width = data.width;
		this.height = data.height;
		this.option = data.option;
		this.instantly = data.instantly;
		this.prohibited = data.prohibited;
		this.onchange = data.onchange;
		this.disabled = data.disabled;
		this.onprogress = data.onprogress;
		this.uploadHandle = this._uploadHandle;
		// #ifdef MP-WEIXIN
		this.uploadHandle = this._uploadHandleWX;
		// #endif
	}


	/**
	 * 创建File节点
	 * @param {string}path webview地址
	 */
	create(path) {
		if (!this.dom) {
			// #ifdef H5
			let dom = document.createElement('input');
			dom.type = 'file'
			dom.value = ''
			dom.style.height = this.height
			dom.style.width = this.width
			dom.style.position = 'absolute'
			dom.style.top = 0
			dom.style.left = 0
			dom.style.right = 0
			dom.style.bottom = 0
			dom.style.opacity = 0
			dom.style.zIndex = 999
			if (this.disabled) dom.style['pointer-events'] = 'none'
			dom.accept = this.prohibited.accept;
			if (this.prohibited.count > 1) {
				dom.multiple = 'multiple';
			}
			dom.onchange = event => {
				for (let file of event.target.files) {
					this.addFile(file);
				}
				this.dom.value = '';
			};
			this.dom = dom;
			// #endif

			// #ifdef APP-PLUS
			let styles = {
				top: '-100px',
				left: 0,
				width: '1px',
				height: '1px',
				background: 'transparent'
			};
			let extras = {
				debug: this.debug,
				instantly: this.instantly,
				prohibited: this.prohibited,
			}
			this.dom = plus.webview.create(path, this.id, styles, extras);
			this.setData(this.option);
			this._overrideUrlLoading();
			// #endif
			return this.dom;
		}
	}

	copyObject(obj) {
		if (typeof obj !== "undefined") {
			return JSON.parse(JSON.stringify(obj));
		} else {
			return obj;
		}
	}

	/**
	 * 自动根据字符串路径设置对象中的值 支持.和[]
	 * @param	{Object} dataObj 数据源
	 * @param	{String} name 支持a.b 和 a[b]
	 * @param	{String} value 值
	 * setValue(dataObj, name, value);
	 */
	setValue(dataObj, name, value) {
		// 通过正则表达式  查找路径数据
		let dataValue;
		if (typeof value === "object") {
			dataValue = this.copyObject(value);
		} else {
			dataValue = value;
		}
		let regExp = new RegExp("([\\w$]+)|\\[(:\\d)\\]", "g");
		const patten = name.match(regExp);
		// 遍历路径  逐级查找  最后一级用于直接赋值
		for (let i = 0; i < patten.length - 1; i++) {
			let keyName = patten[i];
			if (typeof dataObj[keyName] !== "object") dataObj[keyName] = {};
			dataObj = dataObj[keyName];
		}
		// 最后一级
		dataObj[patten[patten.length - 1]] = dataValue;
		this.debug && console.log('参数更新后', JSON.stringify(this.option));
	}

	/**
	 * 设置上传参数
	 * @param {object|string}name 上传参数,支持a.b 和 a[b]
	 */
	setData() {
		let [name, value = ''] = arguments;
		if (typeof name === 'object') {
			Object.assign(this.option, name);
		} else {
			this.setValue(this.option, name, value);
		}

		this.debug && console.log(JSON.stringify(this.option));

		// #ifdef APP-PLUS
		this.dom.evalJS(`vm.setData('${JSON.stringify(this.option)}')`);
		// #endif
	}

	/**
	 * 上传
	 * @param {string}name 文件名称
	 */
	async upload(name = '') {
		if (!this.option.url) {
			throw Error('未设置上传地址');
		}

		// #ifndef APP-PLUS
		if (name && this.files.has(name)) {
			await this.uploadHandle(this.files.get(name));
		} else {
			for (let item of this.files.values()) {
				if (item.type === 'waiting' || item.type === 'fail') {
					await this.uploadHandle(item);
				}
			}
		}
		// #endif

		// #ifdef APP-PLUS
		this.dom && this.dom.evalJS(`vm.upload('${name}')`);
		// #endif
	}

	// 选择文件change
	addFile(file) {
		let name = file.name;
		this.debug && console.log('文件名称', name, '大小', file.size);
		if (file) {
			// 限制文件格式
			let path = '';
			let suffix = name.substring(name.lastIndexOf("."));
			let formats = this.prohibited.formats ? this.prohibited.formats.split(',') : [];
			let isAccept = false;
			if (!formats.length) isAccept = true;
			if (!formats.includes(suffix) && formats.length) return this.toast(`不支持上传${suffix}格式文件`);
			// 限制文件大小
			if (file.size > 1024 * 1024 * Math.abs(this.prohibited.size)) {
				this.toast(`附件大小请勿超过${this.prohibited.size}M`)
				return false;
			}
			// #ifndef MP-WEIXIN
			path = URL.createObjectURL(file);
			// #endif
			// #ifdef MP-WEIXIN
			path = file.path;
			// #endif
			this.files.set(file.name, {
				file,
				path,
				name: file.name,
				size: file.size,
				progress: 0,
				type: 'waiting'
			});

			// #ifndef MP-WEIXIN
			this.onchange(this.files);
			this.instantly && this.upload();
			// #endif

			// #ifdef MP-WEIXIN
			return true;
			// #endif
		}
	}

	/**
	 * 移除文件
	 * @param {string}name 不传name默认移除所有文件，传入name移除指定name的文件
	 */
	clear(name = '') {
		// #ifdef APP-PLUS
		this.dom && this.dom.evalJS(`vm.clear('${name}')`);
		// #endif

		if (!name) {
			this.files.clear();
		} else {
			this.files.delete(name);
		}
		return this.onchange(this.files);
	}

	/**
	 * 提示框
	 * @param {string}msg 轻提示内容
	 */
	toast(msg) {
		uni.showToast({
			title: msg,
			icon: 'none'
		});
	}

	/**
	 * 微信小程序选择文件
	 * @param {number}count 可选择文件数量
	 */
	chooseMessageFile(type, count) {
		wx.chooseMessageFile({
			count: count,
			type: type,
			success: ({
				tempFiles
			}) => {
				for (let file of tempFiles) {
					let next = this.addFile(file);
					if (!next) {
						return
					}
				}
				this.onchange(this.files);
				this.instantly && this.upload();
			},
			fail: () => {
				this.toast(`打开失败`);
			}
		})
	}

	_overrideUrlLoading() {
		this.dom.overrideUrlLoading({
			mode: 'reject'
		}, e => {
			let {
				retype,
				item,
				files,
				end
			} = this._getRequest(
				e.url
			);
			let _this = this;
			switch (retype) {
				case 'updateOption':
					this.dom.evalJS(`vm.setData('${JSON.stringify(_this.option)}')`);
					break
				case 'change':
					try {
						_this.files = new Map([..._this.files, ...JSON.parse(unescape(files))]);
					} catch (e) {
						return console.error('出错了，请检查代码')
					}
					_this.onchange(_this.files);
					break
				case 'progress':
					try {
						item = JSON.parse(unescape(item));
					} catch (e) {
						return console.error('出错了，请检查代码')
					}
					_this._changeFilesItem(item, end);
					break
				default:
					break
			}
		})
	}

	_getRequest(url) {
		let theRequest = new Object()
		let index = url.indexOf('?')
		if (index != -1) {
			let str = url.substring(index + 1)
			let strs = str.split('&')
			for (let i = 0; i < strs.length; i++) {
				theRequest[strs[i].split('=')[0]] = unescape(strs[i].split('=')[1])
			}
		}
		return theRequest
	}

	_changeFilesItem(item, end = false) {
		this.debug && console.log('onprogress', JSON.stringify(item));
		this.onprogress(item, end);
		this.files.set(item.name, item);
	}

	_uploadHandle(item) {
		item.type = 'loading';
		delete item.responseText;
		return new Promise((resolve, reject) => {
			this.debug && console.log('option', JSON.stringify(this.option));
			let {
				url,
				name,
				method = 'POST',
				header,
				formData,
				data
			} = this.option;
			let form = new FormData();
			for (let keys in formData) {
				form.append(keys, formData[keys])
			}
			for (let keys in data) {
				form.append(keys, data[keys])
			}
			form.append(name, item.file);
			let xmlRequest = new XMLHttpRequest();
			xmlRequest.open(method, url, true);
			for (let keys in header) {
				xmlRequest.setRequestHeader(keys, header[keys])
			}
			xmlRequest.upload.addEventListener(
				'progress',
				event => {
					if (event.lengthComputable) {
						let progress = Math.ceil((event.loaded * 100) / event.total)
						if (progress <= 100) {
							item.progress = progress;
							this._changeFilesItem(item);
						}
					}
				},
				false
			);

			xmlRequest.ontimeout = () => {
				console.error('请求超时')
				item.type = 'fail';
				this._changeFilesItem(item, true);
				return resolve(false);
			}

			xmlRequest.onreadystatechange = ev => {
				if (xmlRequest.readyState == 4) {
					if (xmlRequest.status == 200) {
						this.debug && console.log('上传完成：' + xmlRequest.responseText)
						item['responseText'] = xmlRequest.responseText;
						item.type = 'success';
						this._changeFilesItem(item, true);
						return resolve(true);
					} else if (xmlRequest.status == 0) {
						console.error(
							'status = 0 :请检查请求头Content-Type与服务端是否匹配，服务端已正确开启跨域，并且nginx未拦截阻止请求'
						)
					}
					console.error('--ERROR--：status = ' + xmlRequest.status)
					item.type = 'fail';
					this._changeFilesItem(item, true);
					return resolve(false);
				}
			}
			xmlRequest.send(form)
		});
	}

	_uploadHandleWX(item) {
		item.type = 'loading';
		delete item.responseText;
		return new Promise((resolve, reject) => {
			this.debug && console.log('option', JSON.stringify(this.option));
			let form = {
				filePath: item.file.path,
				...this.option
			};
			form['fail'] = ({
				errMsg = ''
			}) => {
				console.error('--ERROR--：' + errMsg)
				item.type = 'fail';
				this._changeFilesItem(item, true);
				return resolve(false);
			}
			form['success'] = res => {
				if (res.statusCode == 200) {
					this.debug && console.log('上传完成,微信端返回不一定是字符串，根据接口返回格式判断是否需要JSON.parse：' +
						res.data)
					item['responseText'] = res.data;
					item.type = 'success';
					this._changeFilesItem(item, true);
					return resolve(true);
				}
				item.type = 'fail';
				this._changeFilesItem(item, true);
				return resolve(false);
			}

			let xmlRequest = uni.uploadFile(form);
			xmlRequest.onProgressUpdate(({
				progress = 0
			}) => {
				if (progress <= 100) {
					item.progress = progress;
					this._changeFilesItem(item);
				}
			})
		});
	}
}